6 most expensive cars for auction at Pebble Beach Concours

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Cars to watch in Pebble Beach

The Pebble Beach Concours d'Elegance started in 1950 with a small group of enthusiasts showing off their cars around a golf tee. It's since become a big-money circus for rich car collectors—part Academy Awards, part art auction, part launch pad for global carmakers and part theme party for millionaires and billionaires.

Yet the chief spectator sport at Concours is auctions. More than $400 million worth of cars are being sold through Sunday—including what is likely to be the most expensive car ever sold at auction.

The previous record was a Mercedes-Benz racer that sold last summer for $31.6 million, including auction fees.

Click ahead to see the top cars to watch, along with their expected sales prices. Estimates are courtesy of Hagerty, Gooding & Co., and RM Auctions.

—By CNBC's Robert FrankPosted 14 Aug. 2014

(Cover image: This 2006 Ferrari FXX Evoluzione will be auctioned off by RM Auctions for an estimated $1.7 million to $2.1 million and is one of a select few "hypercars" designed for ultimate speed and performance.)